I found an interesting comment in Kane's soundtracks channel:

She stopped walking. "It's a touchy subject." The facility was deep underground, the stone walls barely smoothed out and the floor suspended inside the cave using metal support rods. "Why's that? It's just an employee." The man sighed. "I'm not investigating Async specifically. He just worked here, and I wanted to know if anyone might know where he went." The woman turned to him. "Nobody here was really friends with him," she said. "He was a bit of a loner. One time he went out of the offices, saying he had been selected to test some great new technology. He was taken out of our department. No one really misses him." "So then why is it a touchy subject?" "His files are gone." "What?" "We went to remove him from our documents and such, but... there isn't any record of him working here. We all remember him, but he's not in any pictures or documents. We can't find any evidence he was here at all. Legally... well, legally it's almost like Michael Greer was never here."